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distal convoluted tubule

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https://www.readbyqxmd.com/read/28067240/cd8-t-cells-stimulate-na-cl-co-transporter-ncc-in-distal-convoluted-tubules-leading-to-salt-sensitive-hypertension
#1
Yunmeng Liu, Tonya M Rafferty, Sung W Rhee, Jessica S Webber, Li Song, Benjamin Ko, Robert S Hoover, Beixiang He, Shengyu Mu
Recent studies suggest a role for T lymphocytes in hypertension. However, whether T cells contribute to renal sodium retention and salt-sensitive hypertension is unknown. Here we demonstrate that T cells infiltrate into the kidney of salt-sensitive hypertensive animals. In particular, CD8(+) T cells directly contact the distal convoluted tubule (DCT) in the kidneys of DOCA-salt mice and CD8(+) T cell-injected mice, leading to up-regulation of the Na-Cl co-transporter NCC, p-NCC and the development of salt-sensitive hypertension...
January 9, 2017: Nature Communications
https://www.readbyqxmd.com/read/28052988/potassium-sensing-by-renal-distal-tubules-requires-kir4-1
#2
Catherina A Cuevas, Xiao-Tong Su, Ming-Xiao Wang, Andrew S Terker, Dao-Hong Lin, James A McCormick, Chao-Ling Yang, David H Ellison, Wen-Hui Wang
The mammalian distal convoluted tubule (DCT) makes an important contribution to potassium homeostasis by modulating NaCl transport. The thiazide-sensitive Na(+)/Cl(-) cotransporter (NCC) is activated by low potassium intake and by hypokalemia. Coupled with suppression of aldosterone secretion, activation of NCC helps to retain potassium by increasing electroneutral NaCl reabsorption, therefore reducing Na(+)/K(+) exchange. Yet the mechanisms by which DCT cells sense plasma potassium concentration and transmit the information to the apical membrane are not clear...
January 4, 2017: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/28033128/renal-function-of-cyclin-m2-mg2-transporter-maintains-blood-pressure
#3
Yosuke Funato, Daisuke Yamazaki, Hiroaki Miki
OBJECTIVES: Epidemiological studies have shown that magnesium intake/excretion is inversely correlated with blood pressure (BP), and artificial supplementation of magnesium was able to prevent hypertension. However, there has been no molecular genetic study showing the importance of magnesium homeostasis in BP regulation. METHODS: We analyzed magnesium content and BP of mice lacking genes encoding cyclin M (CNNM) Mg transporter family proteins. RESULTS: Systemic heterozygotes and the kidney-specific homozygotes for Cnnm2-deficient alleles are both viable and show hypomagnesemia, indicating the important function of CNNM2 in maintaining magnesium homeostasis in the kidney...
December 28, 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/28003191/calcineurin-inhibitor-cyclosporine-a-activates-renal-na-k-cl-cotransporters-via-local-and-systemic-mechanisms
#4
Katharina Ilse Blankenstein, Aljona Borschewski, Robert Labes, Alexander Paliege, Christin Boldt, James A McCormick, David H Ellison, Michael Bader, Sebastian Bachmann, Kerim Mutig
Calcineurin dephosphorylates NFAT transcription factors, thereby facilitating T-cell mediated immune responses. Calcineurin inhibitors are instrumental for immunosuppression after organ transplantation, but may cause side effects including hypertension and electrolyte disorders. Kidneys were recently shown to display activation of the furosemide-sensitive Na-K-2Cl cotransporter (NKCC2) of the thick ascending limb and the thiazide-sensitive Na-Cl cotransporter (NCC) of the distal convoluted tubule upon calcineurin inhibition using cyclosporin A (CsA)...
December 21, 2016: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/27991910/establishment-and-characterization-of-bhd-f59rsvt-an-immortalized-cell-line-derived-from-a-renal-cell-carcinoma-in-a-patient-with-birt-hogg-dub%C3%A3-syndrome
#5
Mitsuko Furuya, Hisashi Hasumi, Masaya Baba, Reiko Tanaka, Yasuhiro Iribe, Takahiro Onishi, Yoji Nagashima, Yukio Nakatani, Yasuhiro Isono, Masahiro Yao
Hereditary renal cell carcinomas (RCCs) are life-threatening disorders not only for the patients but also for their relatives. Birt-Hogg-Dubé syndrome (BHD) is an autosomal dominant disorder caused by germline mutations in the folliculin gene (FLCN). The protein product, FLCN, functions as a tumor suppressor, and the affected patients have high risks of developing multiple RCCs. The carcinogenic mechanisms stemming from FLCN dysfunction have been investigated using rodent models and human RCC tissues. However, very limited information has been available about in vitro signaling of human renal cells with genetically mutant FLCN...
December 19, 2016: Laboratory Investigation; a Journal of Technical Methods and Pathology
https://www.readbyqxmd.com/read/27983989/potassium-depletion-stimulates-na-cl-cotransporter-via-phosphorylation-and-inactivation-of-the-ubiquitin-ligase-kelch-like-3
#6
Kenichi Ishizawa, Ning Xu, Johannes Loffing, Richard P Lifton, Toshiro Fujita, Shunya Uchida, Shigeru Shibata
Kelch-like 3 (KLHL3) is a component of an E3 ubiquitin ligase complex that regulates blood pressure by targeting With-No-Lysine (WNK) kinases for degradation. Mutations in KLHL3 cause constitutively increased renal salt reabsorption and impaired K(+) secretion, resulting in hypertension and hyperkalemia. Although clinical studies have shown that dietary K(+) intake affects blood pressure, the mechanisms have been obscure. In this study, we demonstrate that the KLHL3 ubiquitin ligase complex is involved in the low-K(+)-mediated activation of Na-Cl cotransporter (NCC) in the kidney...
October 28, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27942049/potassium-depletion-stimulates-na-cl-cotransporter-via-phosphorylation-and-inactivation-of-the-ubiquitin-ligase-kelch-like-3
#7
Kenichi Ishizawa, Ning Xu, Johannes Loffing, Richard P Lifton, Toshiro Fujita, Shunya Uchida, Shigeru Shibata
Kelch-like 3 (KLHL3) is a component of an E3 ubiquitin ligase complex that regulates blood pressure by targeting With-No-Lysine (WNK) kinases for degradation. Mutations in KLHL3 cause constitutively increased renal salt reabsorption and impaired K(+) secretion, resulting in hypertension and hyperkalemia. Although clinical studies have shown that dietary K(+) intake affects blood pressure, the mechanisms have been obscure. In this study, we demonstrate that the KLHL3 ubiquitin ligase complex is involved in the low-K(+)-mediated activation of Na-Cl cotransporter (NCC) in the kidney...
2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27909897/nha2-is-expressed-in-distal-nephron-and-regulated-by-dietary-sodium
#8
Kalyan C Kondapalli, R Todd Alexander, Jennifer L Pluznick, Rajini Rao
Increased renal reabsorption of sodium is a significant risk factor in hypertension. An established clinical marker for essential hypertension is elevated sodium lithium countertransport (SLC) activity. NHA2 is a newly identified Na(+)(Li(+))/H(+) antiporter with potential genetic links to hypertension, which has been shown to mediate SLC activity and H(+)-coupled Na(+)(Li(+)) efflux in kidney-derived MDCK cells. To evaluate a putative role in sodium homeostasis, we determined the effect of dietary salt on NHA2...
December 1, 2016: Journal of Physiology and Biochemistry
https://www.readbyqxmd.com/read/27906866/inherited-and-acquired-disorders-of-magnesium-homeostasis
#9
Matthias Tilmann Florian Wolf
PURPOSE OF REVIEW: Magnesium (Mg) imbalances are frequently overlooked. Hypermagnesemia usually occurs in preeclamptic women after Mg therapy or in end-stage renal disease patients, whereas hypomagnesemia is more common with a prevalence of up to 15% in the general population. Increasing evidence points toward a role for mild-to-moderate chronic hypomagnesemia in the pathogenesis of hypertension, type 2 diabetes mellitus, and metabolic syndrome. RECENT FINDINGS: The kidneys are the major regulator of total body Mg homeostasis...
November 30, 2016: Current Opinion in Pediatrics
https://www.readbyqxmd.com/read/27906863/bartter-s-and-gitelman-s-syndrome
#10
Hannsjörg W Seyberth, Stefanie Weber, Martin Kömhoff
PURPOSE OF REVIEW: The clinical presentations of Bartter's syndrome and Gitelman's syndrome will be reviewed including two most recently described hypokalemic salt-losing tubulopathies. By taking the quite heterogeneous presentations and the apparently different pathophysiologies as the basis, the applicability of the physiologic classification has been tested. RECENT FINDINGS: According to the physiologic approach, salt-losing tubulopathies can be divided into two major groups (with completely different tubular defects): first, disorders of the thick ascending limb of Henle's loop (loop disorders); second, disorders of the distal convolute tubule (DCT disorders)...
November 30, 2016: Current Opinion in Pediatrics
https://www.readbyqxmd.com/read/27882813/dietary-zinc-modifies-diabetic-induced-renal-pathology-in-rats
#11
Wael M Elsaed, Hazem Abdelhamid Mohamed
This study was conducted to investigate how far dietary zinc (Zn) modifies the histomorphological alterations induced by diabetes in rat kidneys. The animals were divided into negative control group (10 rats). Diabetes was induced in thirty animals by streptozotocin. After confirming diabetes, the animals were divided into three groups (n = 10). Group II served as the positive control group (fed on standard diet), group III was fed on Zn deficient diet, and group IV was fed on Zn supplemented diet. Caspase-3 immune staining was used to estimate the caspase activity...
November 24, 2016: Renal Failure
https://www.readbyqxmd.com/read/27798456/future-considerations-based-on-the-information-from-barrter-s-and-gitelman-s-syndromes
#12
Hadas Alfandary, Daniel Landau
PURPOSE OF REVIEW: Bartter and Gitelman syndromes are typical normotensive salt losing hypokalaemic tubulopathies. Their pathogenesis was gradually deciphered in the past 5 decades, first by typical salt balance studies and histopathology, followed by genetic characterization and discovery of the affected different ion channels. Although the different genotypic subtypes were originally thought to show a similar phenotype, important clinical and biochemical differences can now be found...
January 2017: Current Opinion in Nephrology and Hypertension
https://www.readbyqxmd.com/read/27789743/channel-transporter-complexes-an-emerging-theme-in-cell-signaling
#13
Geoffrey W Abbott
In a recent edition of Biochemical Journal, Mistry and colleagues described the discovery of a novel protein complex, formed from the epithelial sodium channel (ENaC) and the sodium chloride cotransporter (NCC) [Biochem. J. (2016) Hoover, S.R]. The importance of these two proteins in the regulation of salt balance and blood pressure has long been known, as has their overlapping expression in the distal convoluted tubule of the kidney. The new study by Mistry et al. now demonstrates their physical interaction in the kidney and when heterologously co-expressed...
November 1, 2016: Biochemical Journal
https://www.readbyqxmd.com/read/27753890/ish-nia-os-05-interleukin-6-transactivation-of-the-mineralocorticoid-receptor
#14
Brandi Wynne, Trinity Kronk, Otor Al-Khalili, Benjamin Ko, Franziska Theilig, Douglas Eaton, Robert Hoover
OBJECTIVE: Hypertension is characterized by increased sodium reabsorption along the aldosterone-sensitive distal nephron (ASDN) and systemic inflammation. Interleukin-6 (IL-6) is a possible mediator, signaling via the transmembrane IL-6 receptor alpha (IL-6Rα); however, whether IL-6Rα is present in the distal convoluted tubule (DCT) is unknown. Increased sodium reabsorption is not always correlated with increased aldosterone (Aldo). Thus, understanding how Aldo-independent sodium reabsorption occurs is critical...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27752013/transient-distal-renal-tubular-acidosis-following-hump-nosed-viper-bite-two-cases-from-sri-lanka
#15
Ranga M Weerakkody, Pushpa N Lokuliyana, Ruchika D Lanerolle
Hump-nosed viper (Hypnale hypnale; HNV) is one of the six major snake species in Sri Lanka that cause envenomation. Nephrotoxicity, coagulopathy, and neurotoxicity are wellrecognized features of its envenomation. Type 4 renal tubular acidosis (RTA4) has only once been described previously in this condition, and we report two further cases. Two patients aged 53 and 51 presented following HNV bites with acute kidney injury and microangiopathic hemolytic anemia. Both underwent multiple cycles of hemodialysis until the polyuric phase was reached...
September 2016: Saudi Journal of Kidney Diseases and Transplantation
https://www.readbyqxmd.com/read/27742514/transient-diabetes-insipidus-after-discontinuation-of-vasopressin-in-neurological-icu-patients-case-series-and-literature-review
#16
Michael A Bohl, James Forseth, Peter Nakaji
BACKGROUND: Arginine vasopressin (AVP) is a common second-line or third-line vasopressor used in critically ill neurosurgical patients. Neurosurgical indications include hyperdynamic therapy for vasospasm, maintenance of cerebral perfusion pressure in patients with intracranial hypertension, and prevention of hypotension in patients with sepsis. CASE DESCRIPTION: A series of six neurosurgical patients receiving AVP infusions developed severe but transient diabetes insipidus (tDI) after cessation of AVP...
October 11, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27733368/long-term-aldosterone-administration-increases-renal-na-cl-cotransporter-abundance-in-late-distal-convoluted-tubule
#17
Søren Brandt Poulsen, Birgitte M Christensen
Renal Na+-Cl- cotransporter (NCC) is expressed in early distal convoluted tubule (DCT) 1 and late DCT (DCT2). NCC activity can be stimulated by aldosterone, and the mechanism is assumed to depend on the enzyme, 11β-hydroxysteroid dehydrogenase type 2 (11β-HSD2), which inactivates glucocorticoids that would otherwise occupy aldosterone receptors. Because 11β-HSD2 in rat may only be abundantly expressed in DCT2 cells and not in DCT1 cells, it has been speculated that aldosterone specifically stimulates NCC activity in DCT2 cells...
October 12, 2016: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/27643236/ish-nia-os-05-interleukin-6-transactivation-of-the-mineralocorticoid-receptor
#18
Brandi Wynne, Trinity Kronk, Otor Al-Khalili, Benjamin Ko, Franziska Theilig, Douglas Eaton, Robert Hoover
OBJECTIVE: Hypertension is characterized by increased sodium reabsorption along the aldosterone-sensitive distal nephron (ASDN) and systemic inflammation. Interleukin-6 (IL-6) is a possible mediator, signaling via the transmembrane IL-6 receptor alpha (IL-6Rα); however, whether IL-6Rα is present in the distal convoluted tubule (DCT) is unknown. Increased sodium reabsorption is not always correlated with increased aldosterone (Aldo). Thus, understanding how Aldo-independent sodium reabsorption occurs is critical...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27636893/a-microrna-cluster-mir-23%C3%A2-24%C3%A2-27-is-upregulated-by-aldosterone-in-the-distal-kidney-nephron-where-it-alters-sodium-transport
#19
X Liu, R S Edinger, C A Klemens, Y L Phua, A J Bodnar, W A LaFramboise, J Ho, M B Butterworth
The epithelial sodium channel (ENaC) is expressed in the epithelial cells of the distal convoluted tubules, connecting tubules and cortical collecting duct (CCD) in the kidney nephron. Under the regulation of the steroid hormone aldosterone, ENaC is a major determinant of sodium (Na(+) ) and water balance. The ability of aldosterone to regulate microRNAs (miRs) in the kidney has recently been realized, but the role of miRs in Na(+) regulation has not been well established. Here we demonstrate that expression of a miR cluster mmu-miR-23∼24∼27, is upregulated in the CCD by aldosterone stimulation both in vitro and in vivo...
September 16, 2016: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/27600180/k-mediated-regulation-of-distal-convoluted-tubule-na-cl-cotransporter-phosphorylation-during-angiotensin-ii-induced-hypertension
#20
EDITORIAL
Pablo A Ortiz
No abstract text is available yet for this article.
October 2016: Hypertension
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